Truck cab



FIG. 1 is a perspective view of the top, front and left side of a truck cab showing our new design, it being understood that the broken lines are for illustrative purpose only and form no part of the claimed design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a front elevation view thereof. 

The ornamental design for a truck cab, as shown and described. 